by gt4mike » Tue Dec 14, 2004 8:33 am
You need to remember that wheel bearings are designing to take pretty strenuous loads going over bumps, and cornering at high speeds, which I'd say will be massively in excess of the difference made from spacing the wheels a small amount. Also spacers are often used to get the wheels located in the same position as the standard wheels, and more often than not the bearing isnt centred in the width of the wheel, so just about all cars will be placing an uneven load across the bearing during rest. If you do put spacers on I'd just keep an eye on the play in the bearings - and if they do wear out you can just replace them.
I think the most critical part is that if you are spacing the wheels out you find a solution that maintains the centre locater for the wheel. If you don't have that you do put all the weight of the car on the studs - which they aren't designed for. The reason the clamped down on spacers was people with the flat plate type ones which left all the cars weight on the studs having their wheels coming off going over bumps and around corners. Most of the japanese bolt on type ones are machined to locate onto the existing locater, and also have a locater machined on the wheel side of the spacer.